When things are examined by right knowledge there are no signs obtainable which would characterize them with marks of individuality and generality, therefore, they are said to have no self-nature. Because these signs of individuality and generality are seen both as existing and yet are known to be non-existent, are seen as going out and yet are known not to be going out, they are never annihilated. Why is this true? For this reason; because the individual signs that should make up the self-nature of all things are non-existent. Again in their self-nature things are both eternal and non-eternal. Things are not eternal because the marks of individuality appear and disappear, that is, the marks of self-nature are characterized by non-eternality. On the other hand, because things are unborn and are only mind-made, they are in a deep sense eternal. That is, things are eternal because of their very non-eternality.

(The Lankavatara Sutra)